FDI World Dental Federation notation (also "FDI notation" or "ISO 3950 notation") is the world's most commonly used dental notation (tooth numbering system). It is designated by the International Organization for Standardization as standard ISO 3950 "Dentistry — Designation system for teeth and areas of the oral cavity".
The system is developed by the FDI World Dental Federation. It is also used by the World Health Organization, and is used in most countries of the world except the United States (which uses the UNS) and the United Kingdom (where the older Palmer notation is used).
Orientation of the chart is traditionally "dentist's view", i.e. patient's right corresponds to notation chart left. The designations "left" and "right" on the chart below correspond to the patient's left and right.
|patient's upper right||patient's upper left|
|patient's lower right||patient's lower left|
|Deciduous teeth (baby teeth)|
|upper right||upper left|
|lower right||lower left|
Codes, names, and usual number of roots: (see chart of teeth at Universal Numbering System)
Syntax: <quadrant code><tooth code>
Sometimes a dot is inserted between quadrant code and tooth code in order to avoid ambiguity with other numbering systems, especially the UNS.
|1||upper right permanent teeth|
|2||upper left permanent teeth|
|3||lower left permanent teeth|
|4||lower right permanent teeth|
|5||upper right deciduous teeth|
|6||upper left deciduous teeth|
|7||lower left deciduous teeth|
|8||lower right deciduous teeth|
|This is set by going clockwise from the dentist's view.|
|4||1st premolars (permanent teeth) / 1st molar (deciduous teeth)|
|5||2nd premolars (permanent teeth) / 2nd molar (deciduous teeth)|
|6||1st molars (permanent teeth)|
|7||2nd molars (permanent teeth)|
|8||3rd molars (permanent teeth)|
|This is defined by counting.|